Mass of Reactants and Products

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In summary, to calculate the mass in grams of iodine (I2) that will react completely with 23g of aluminum (Al) to form aluminum iodide (AlI3), you need to use the reaction 3I2 + 2Al ---> 2AlI3 and pay attention to the mole ratios. The formula weight for Aluminum is 26.98g/mol, so 23g of Aluminum is equal to 0.853 mol. From the mole ratios, you can see that 2 moles of Aluminum react with 3 moles of Iodine. Therefore, 0.853 mol of Aluminum will react with (0.853 mol x (3 mol/2 mol) = 1
  • #1
mightyhealthy
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Homework Statement


Calculate the mass in grams of iodine(I2) that will react completely with 23g of aluminum (Al) to form aluminum iodide (AlI3).


Homework Equations





The Attempt at a Solution



don't even know where to start

mol mol avogrado mol
 
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  • #2
Write the reaction to start. Next, use the information in the PROPERLY BALANCED reaction to find mole ratios. Do the rest.
 
  • #3
symbolipoint said:
Write the reaction to start. Next, use the information in the PROPERLY BALANCED reaction to find mole ratios. Do the rest.

ok I've had this for a day:

3I2+2Al---->2AlI3


761.4g
3 mol

53.96g
2 mol

815.36g
2 mol

now what?
 
  • #4
Nice Reaction Notation. Now, pay attention to the MOLE RATIOS indicated in that reaction. What is the formula weight for Aluminum? You are starting with 23 grams of Aluminum.
How many moles of Aluminum is this?
How many moles of Iodine are needed?
How many grams of Iodine is this?
 

1. What is the definition of mass of reactants and products?

The mass of reactants and products refers to the total amount of matter present in a chemical reaction. It includes the starting materials (reactants) and the resulting substances (products) after the reaction has taken place.

2. How is the mass of reactants and products determined?

The mass of reactants and products can be determined by measuring the amount of each substance before and after the reaction. This can be done using a balance or scale to measure the mass of solid reactants and products, and a graduated cylinder to measure the volume of liquid reactants and products.

3. Why is it important to consider the mass of reactants and products in a chemical reaction?

The law of conservation of mass states that in a closed system, the mass of reactants must equal the mass of products. This means that no matter can be created or destroyed in a chemical reaction. By considering the mass of reactants and products, we can ensure that the reaction obeys this fundamental law.

4. How does the mass of reactants and products relate to the stoichiometric ratio?

The stoichiometric ratio is the ratio of reactants and products in a chemical reaction based on their balanced equation. The mass of reactants and products can be used to calculate the stoichiometric ratio, as it represents the relative amounts of each substance involved in the reaction.

5. Can the mass of reactants and products change during a chemical reaction?

No, according to the law of conservation of mass, the total mass of reactants and products must remain constant in a closed system. However, the physical state or appearance of the substances may change, leading to a perception of a change in mass. This can be explained by the rearrangement of atoms in the reaction, but the total number of atoms and their mass remains the same.

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